The tricky triggers have been mentioned a few times. I don't have the mental fortitude to get past the coins, I just keep missing the last one. But looking at the screenshots I wish I did.
Because hot dang from what I have seen and played, this is a great entry. Wonderful concept, nicely executed. I can see a story forming and whether it's actually being told or not, little Spark has so much potential as an interactive companion. This is one of those jam games I will show to non-jammers simply because its creativity is so well paired with clean execution, it's a treat to play.